Is there any other jailbreak for software 4.2.1 besides redsn0w?

i want to jailbreak my ipod again. redsn0w wont work because my desktop fried, and i cant sync my ipod without losing all of my songs. if i dont sync it, i caant get redsn0w to recognize the firmware and it wont work. also, if my ipod needs to be synced, what are some good FREE softwares to put my songs from my ipod to itunes so i can get this to work
 
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